For fun you could do this with a macro too.
- begin recording macro...
- number 1 (bound to key 1, really, doesn't need to be a number, any alphanumeric char would do)
- find the next ...
- append a ...
- carriage return/line feed
- go back into command mode
- ...and finish recording the macro. Now, ...
- 100 times
- execute macro ...
- number 1
Granted, that's imprecise because you have to know how many periods you have in the file (or over-guess and clean up afterwards), but it's just a neat little exercise.